Fix select more|less processing

[d-m-bailey]

Fixes #295

However, I feel that this is a bad patch to a poor implementation.

[d-m-bailey]

There may be a better solution. Don't merge this just yet.

[d-m-bailey]

@RTimothyEdwards Instead of modifying tx_argc, I was considering using a pstart variable like in commands/CmdFI.c to keep track of the first relevant parameter. However, tx_argc is used in many places.
In other commands/Cmd*.c programs, locargc is used.

The solution in this merge is a kludge, but it may be a minimal change.

Could you please decide what to do?

[RTimothyEdwards]

I just pushed what I think is the right solution to this issue. The CmdSelect() code was messing with the number of arguments directly instead of keeping a separate count of non-qualifier arguments. My correction appears to solve the issue with "select more cell" and "select less cell" without breaking anything else, and the code is cleaner.

[d-m-bailey]

@RTimothyEdwards as always, thanks for looking into this. I'll test it once it's on the public repo.